HAL : ird-00389586, version 1

DOI : 10.1016/j.rse.2009.02.013

Code IRD Horizon : fdi:010045985

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Remote Sensing of Environment 113, 6 (2009) 1304-1312

Soil moisture retrievals at L-band using a two-step inversion approach (COSMOS/NAFE'05 Experiment)

K. Saleh (  Auteur correspondant ) 1, Yann H. Kerr 2, Philippe Richaume 2, Mj Escorihuela 2, R. Panciera 3, S. Delwart 4, G. Boulet 2, P. Maisongrande 2, J. P. Walker 5, P. Wursteisen 4, J.P. Wigneron 6

(2009)

COSMOS (Campaign for validating the Operation of Soil Moisture and Ocean Salinity), and NAFE (National Airborne Field Experiment) were two airborne campaigns held in the Goulburn River catchment (Australia) at the end of 2005. These airborne measurements are being used as benchmark data sets for validating the SMOS (Soil Moisture and Ocean Salinity) ground segment processor over prairies and crops. This paper presents results of soil moisture inversions and brightness temperature simulations at different resolutions from dual-polarisation and multi-angular L-band (1.4 GHz) measurements obtained from two independent radiometers. The aim of the paper is to provide a method that could overcome the limitations of unknown surface roughness for soil moisture retrievals from L-band data. For that purpose, a two-step approach is proposed for areas with low to moderate vegetation. Firstly, a two-parameter inversion of surface roughness and optical depth is used to obtain a roughness correction dependent on land use only. This step is conducted over small areas with known soil moisture. Such roughness correction is then used in the second step, where soil moisture and optical depth are retrieved over larger areas including mixed pixels. This approach produces soil moisture retrievals with root mean square errors between 0.034 m3 m−3 and 0.054 m3 m−3 over crops, prairies, and mixtures of these two land uses at different resolutions.

1 :	University of Cambridge, UK (Department Of Geography)
	Université de Cambridge
2 :	Centre d'études spatiales de la biosphère (CESBIO)
	CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
3 :	Department of Civil and Environmental Engineering (Melbourne)
	University of Melbourne
4 :	European Space Research and Technology Centre (ESTEC)
	ESA - European Space Agency
5 :	Department of Civil and Environmental Engineering
	Department of Civil and Environment
6 :	Écologie fonctionnelle et physique de l'environnement (EPHYSE - UR1263)
	Institut national de la recherche agronomique (INRA) : UR1263

domaine

:

Sciences du Vivant/Ecologie, Environnement/Ecosystèmes

mots-clés : SMOS – Soil moisture – L-band – Radiometry – Soil roughness COSMOS – NAFE

ird-00389586, version 1

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Contributeur : Dominique Bruel <>

Soumis le : Vendredi 29 Mai 2009, 09:48:22

Dernière modification le : Vendredi 29 Mai 2009, 12:34:24